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13.31.15 isnanf

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Floating-Point-Classes.html,
• man isnanf.

Gnulib module: isnanf

Portability problems fixed by Gnulib:

• This function is missing on some platforms: macOS 14, Minix 3.1.8, AIX 5.1, HP-UX 11, MSVC 14.

Portability problems not fixed by Gnulib: